Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
976
CALL
Burlington
BURL
$21.8B
| $3.26M | 0.01% |
208
+63
| +43% | +$10.2K |
|
977
CALL
Robert Half
RHI
$3.65B
| $3.26M | 0.01% |
500
+440
| +733% | +$27.9K |
|
978
CALL
New Oriental
EDU
$7.84B
| $3.24M | 0.01% |
360
-188
| -34% | -$14.2K |
|
979
CALL
Neurocrine Biosciences
NBIX
$17.6B
| $3.24M | 0.01% |
368
-295
| -44% | -$24.7K |
|
|
BLUE
980
CALL
DELISTED
bluebird bio
BLUE
| $3.24M | 0.01% |
16
-5
| -24% | -$8.8K |
|
|
TMX
981
CALL
DELISTED
Terminix Global Holdings, Inc.
TMX
| $3.24M | 0.01% |
694
+682
| +5,683% | +$28.5K |
|
982
CALL
CMS Energy
CMS
$23.3B
| $3.23M | 0.01% |
+582
| New | +$30.7K |
|
983
CALL
Puma Biotechnology
PBYI
$405M
| $3.23M | 0.01% |
832
+664
| +395% | +$20.3K |
|
984
CALL
WIX.com
WIX
$2.09B
| $3.23M | 0.01% |
267
+73
| +38% | +$7.93K |
|
985
CALL
Zebra Technologies
ZBRA
$12.4B
| $3.23M | 0.01% |
154
+73
| +90% | +$13.7K |
|
986
CALL
Scotiabank
BNS
$106B
| $3.22M | 0.01% |
605
-60
| -9% | -$3.29K |
|
987
PUT
Campbell Soup
CPB
$6.45B
| $3.22M | 0.01% |
845
+40
| +5% | +$1.41K |
|
988
CALL
Qiagen
QGEN
$8.51B
| $3.22M | 0.01% |
747
+714
| +2,164% | +$28.7K |
|
|
CERN
989
CALL
DELISTED
Cerner Corp
CERN
| $3.21M | 0.01% |
562
+406
| +260% | +$22.6K |
|
990
PUT
MasTec
MTZ
$27.3B
| $3.21M | 0.01% |
667
+623
| +1,416% | +$28K |
|
|
WAGE
991
CALL
DELISTED
WageWorks, Inc.
WAGE
| $3.2M | 0.01% |
848
+837
| +7,609% | +$27.3K |
|
992
CALL
KeyCorp
KEY
$24.3B
| $3.2M | 0.01% |
2,033
+1,671
| +462% | +$27.9K |
|
|
CYBR
993
PUT
DELISTED
CyberArk
CYBR
| $3.19M | 0.01% |
268
+162
| +153% | +$15.5K |
|
994
TransDigm Group
TDG
$69.9B
| $3.19M | 0.01% |
7,026
-6,475
| -48% | -$2.63M |
|
995
PUT
GoDaddy
GDDY
$12.2B
| $3.19M | 0.01% |
424
+135
| +47% | +$9.49K |
|
996
CALL
Alcoa
AA
$11.7B
| $3.18M | 0.01% |
1,131
+482
| +74% | +$13.8K |
|
997
PUT
Harley-Davidson
HOG
$2.75B
| $3.18M | 0.01% |
893
+134
| +18% | +$4.88K |
|
998
Pinduoduo
PDD
$118B
| $3.17M | 0.01% |
128,023
+110,822
| +644% | +$2.97M |
|
999
PUT
Southern Company
SO
$110B
| $3.17M | 0.01% |
613
+363
| +145% | +$17.8K |
|
1000
CALL
Freeport-McMoran
FCX
$87.9B
| $3.16M | 0.01% |
2,453
-2,402
| -49% | -$29.1K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.